US3556254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic metal plank for scaffolds
Assignee: Individual
•
Filing: 1969-06-20
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Granted: 1971-01-19
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Expires: 1989-06-20
Abstract
Abstract An extensible and retractable sheet metal plank made up of several, more or less, channel-shaped telescopingly connected plank-forming sections made, for example, in lengths of 4 feet, 6 feet or 8 feet and adapted for use when erecting a knockdown-type scaffold. The depending channel-forming flanges are provided with tracks slidingly nested together and having stop lugs which coact in limiting the positions of the fully extended sections.
Inventors
- 👤 Forest J Lambert
- 👤 Philip T Look
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
E; E04; E04G; E04G5/00; E04G5/08; E04G1/00; E04G1/15; E04G2001/157
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
184 words
A portable, extensible and retractable plank adapted for incorporation in a knockdown scaffold comprising a plurality of companion plank-forming sections, each section being made of rigid sheet material, being elongated and channel-shaped in cross section and embodying a web portion provided along its respective longitudinal edges with depending spaced parallel flanges commensurate in length with the length of said web and having bottom edges provided with rigidifying and guide tracks coextensive in length and integrally joined with their respectively cooperably depending channel flanges, each guide track embodying (1) a first horizontal flange disposed at a right angle to its coacting channel-flange and underlying the channelweb in spaced parallel relation and (2) a second vertical flange which is joined to an inward lengthwise edge of said first flange and which has an upper longitudinal edge spaced below the level of said web, the upper marginal edges of said second vertical flanges being provided with coordinating limit stop lugs which are located and abut each other in a manner to check and limit the respective extended positions of the sections when they have been fully extended.
Claim 2
Dependent Claim
184 words
A portable, extensible and retractable plank adapted for incorporation in a knockdown scaffold comprising a plurality of companion plank-forming sections, each section being made of rigid sheet material, being elongated and channel-shaped in cross section and embodying a web portion provided along its respective longitudinal edges with depending spaced parallel flanges commensurate in length with the length of said web and having bottom edges provided with rigidifying and guide tracks coextensive in length and integrally joined with their respectively cooperably depending channel flanges, each guide track embodying (1) a first horizontal flange disposed at a right angle to its coacting channel-flange and underlying the channelweb in spaced parallel relation and (2) a second vertical flange which is joined to an inward lengthwise edge of said first flange and which has an upper longitudinal edge spaced below the level of said web, the upper marginal edges of said second vertical flanges being provided with coordinating limit stop lugs which are located and abut each other in a manner to check and limit the respective extended positions of the sections when they have been fully extended.
Claim 3
Dependent Claim
52 words
The plank defined in and according to claim 1, and wherein said plank sections and said guide tracks are open at their respective ends and the guide tracks of the respective sections are proportional in size and are telescopingly nested together, said thus nested guide tracks coacting in stabilizing the overall plank.
Claim 4
Dependent Claim
67 words
The plank defined in and according to claim 1, and wherein certain of said limit stop lugs are horizontal and are situated at the extreme terminal ends of the second vertical flanges on which they are mounted and certain others of said lugs are vertical and coplanar with their coacting vertical flanges and are situated inwardly of and spaced from an adjacent end of the coordinating channel.
Claim 5
Dependent Claim
127 words
For use in constructing a portable, extensible and retractable scaffold plank: an elongated plank constructing section made of rigid lightweight sheet material, said section embodying a relatively broad flat-faced web having longitudinal edges provided with relatively narrow depending spaced parallel flanges, said web and flanges providing an open ended channel, the bottom edge of each channel flange having a first horizontal track flange which is disposed at right angles to the channel flange and is spaced below and parallel with said web and has an inward edge provided with a second integral vertical upstanding track flange which is parallel with the channel flange and has an upper longitudinal edge underlying and spaced below said web and which is provided with an integral lug constituting a limit stop.
Claim 6
Dependent Claim
127 words
For use in constructing a portable, extensible and retractable scaffold plank: an elongated plank constructing section made of rigid lightweight sheet material, said section embodying a relatively broad flat-faced web having longitudinal edges provided with relatively narrow depending spaced parallel flanges, said web and flanges providing an open ended channel, the bottom edge of each channel flange having a first horizontal track flange which is disposed at right angles to the channel flange and is spaced below and parallel with said web and has an inward edge provided with a second integral vertical upstanding track flange which is parallel with the channel flange and has an upper longitudinal edge underlying and spaced below said web and which is provided with an integral lug constituting a limit stop.
Claim 7
Dependent Claim
49 words
The elongated plank section defined in and according to claim 4, and wherein said limit stop lug is disposed in a horizontal plane which is at right angles to the vertical plane of said track flange and is situated at an extreme free terminal end of said track flange.
Claim 8
Dependent Claim
43 words
The elongated plank section defined in and according to claim 4, and wherein said limit stop lug is coplanar with said vertical upstanding track flange and is situated inwardly and is thus spaced from an adjacent open end of said open ended channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |